Bump minitest from 5.11.3 to 5.12.2

[dependabot-preview]

Bumps minitest from 5.11.3 to 5.12.2.

Changelog

Sourced from minitest's changelog.

=== 5.12.2 / 2019-09-28

• 1 bug fix:

  • After chatting w/ @​y-yagi and others, decided to lower support to include ruby 2.2.

=== 5.12.1 / 2019-09-28

• 1 minor enhancement:

  • Added documentation for Reporter classes. (sshaw)

• 3 bug fixes:

  • Avoid using 'match?' to support older ruby versions. (y-yagi)
  • Fixed broken link to reference on goodness-of-fit testing. (havenwood)
  • Update requirements in readme and Rakefile/hoe spec.

=== 5.12.0 / 2019-09-22

• 8 minor enhancements:

  • Added a descriptive error if assert_output or assert_raises called without a block. (okuramasafumi)
  • Changed mu_pp_for_diff to make having both \n and \n easier to debug.
  • Deprecated $N for specifying number of parallel test runners. Use MT_CPU.
  • Deprecated use of global expectations. To be removed from MT6.
  • Extended Assertions#mu_pp to encoding validity output for strings to improve diffs.
  • Extended Assertions#mu_pp to output encoding and validity if invalid to improve diffs.
  • Extended Assertions#mu_pp_for_diff to make escaped newlines more obvious in diffs.
  • Fail gracefully when expectation used outside of it.

• 3 bug fixes:

  • Check option[:filter] klass before match. Fixes 2.6 warning. (y-yagi)
  • Fixed Assertions#diff from recalculating if set to nil
  • Fixed spec section of readme to not use deprecated global expectations. (CheezItMan)

Commits

• 7af05b7 prepped for release
• 307ebdd - After chatting w/ @​y-yagi and others, decided to lower support to include r...
• 930ec0b prepped for release
• ed197db - Fixed broken link to reference on goodness-of-fit testing. (havenwood)
• 876f301 Added mini-apivore to readme.
• c6352b4 - Update requirements in readme and Rakefile/hoe spec.
• 6d9b78d + Added documentation for Reporter classes. (sshaw)
• 5d95229 Added minitest-global_expectations to readme. (jeremyevans)
• 72accb0 - Avoid using 'match?' to support older ruby versions. (y-yagi)
• d7f1133 Tweaked multithreading section of README. (iHiD)
• Additional commits viewable in compare view

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Superseded by #18.